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Phonon density of states in NdFeAsO1xFx

M. Le Tacon, M. Krisch, A. Bosak, J.-W. G. Bos, and S. Margadonna
Phys. Rev. B 78, 140505(R) – Published 6 October 2008

Abstract

We report measurements of the phonon density of states in iron oxypnictide superconductors by inelastic x-ray scattering. Good agreement with ab initio calculations that do not take into account strong electronic correlations is found, and an unpredicted softening of phonon branches under F doping of these compounds is observed. Raman-scattering experiments lead us to conclude that this softening is not related to zone-center phonons, and consequently imply an important softening of the relevant phonon branches at finite-momentum transfer Q.

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  • Received 7 July 2008

DOI:https://doi.org/10.1103/PhysRevB.78.140505

©2008 American Physical Society

Authors & Affiliations

M. Le Tacon, M. Krisch, and A. Bosak

  • European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France

J.-W. G. Bos and S. Margadonna

  • School of Chemistry, University of Edinburgh, West Mains Road, EH9 3JJ Edinburgh, United Kingdom

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Issue

Vol. 78, Iss. 14 — 1 October 2008

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